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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad456f3b94f6c7d64c22c367b09fed137a7eb344dba74163fc5f5cc970c72fd7' 
  AND token = 'K55jG2p2ac4hAcCvG92xNZFAESOquIbq3dLVNXb1q6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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