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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80dab4532723a93a6a3eee86676a2c2e8d15d95d47fecd81c9a6e765443517d7' 
  AND token = '0fdyGb3/y6ylMzg1w2RMllpQoJV2y2aMQ22i2nxkjfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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