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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb58e0d371ad1b2a54e308c74a3a856178230aac11911d18a48c47571e238fa9' 
  AND token = 'kVwOPHnTWStZHnFeKNgUKgm7sxmWJZaTpc1Q5RDFjQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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