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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac7eea4ce0b7b42e85a0652f0004ff1dba8d6442e3ae3ef7cff35735a50c485' 
  AND token = 'uTKKu7EMFpg4ilLKBK3q9hZjjIsaPC4Gb9vyUcIvy0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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