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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '917d06f26da396d4f1b509e4562a0f03700a7311cae28944b5b6d87204bcd582' 
  AND token = 'I9vryXlYK6PpLJlmIqr7zIW8CJdN7ZUJ4oFmZ2yKDbY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}