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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02ca42cc6b153450e61b4f8f96b68f7a696068104f34a4055d1790bed3e0a70a' 
  AND token = 'nMJtUm1rB0FNQd7XeFrAwiWWr2KteavQ1/qWuqxCtFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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