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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '347ea930947bb27fef5931f099814d21cde90ad7f18e7f14aae8568e4045eada' 
  AND token = 'izpPgjBtXOpuZQO2gRij/Lj4HdpHAz/qFuuPDdRkZow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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