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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b34575600d7c258c3bf55a9130b13443703c24499c93986e352c67f9b0610645' 
  AND token = '+wWDc07e46P8cvwQfuN2MigZhypt1ovmM9QNZpQevmw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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