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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a792cc4696fcaee61fdd9047942b1b76cca9d60115ef5f43be6f84921966c3bd' 
  AND token = 'gtyso/+C0DBwXte9oTocCIVFiv44GNzsUFFZaQmK1Uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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