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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab40fc32aad656d3d35861fdfccb0ba46ce1c54807341375ed3d67ef5e024d21' 
  AND token = 'roU9bf5p6TWZ8rHzuKERkHQUQgJiJ24+XNML5WWeqGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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