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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11559d8b3cf2d20214e4dd579f37f7dedf7ff3b70fbc0682a3dadcad7fb4f50d' 
  AND token = '1yHKtxnhv3g3ZIqHImsKm+B2VF0cEGzxavPILUtoRk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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