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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e135104c56b6c2a26f8cb2ab332d28e68c26a883ffe62e55fb0326df37f2f03' 
  AND token = 'fh4kXX1v8JNQ7Zq3MNzncIDmuYe0TWYatORgTM9euAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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