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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38c6688b4af3be8e35ea11b8e0b2a8a24d751811cfc447ec77c1a94892e84880' 
  AND token = 'eC79UhsiTsIRKdUIz2R2YccZwtvPFskMlSH4BMuR42k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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