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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aeac0086f9236f277ac5c5624e7ff4676b139637546ae7539cbabff46cfb7c7' 
  AND token = 'bKrM8VVtHH6WozLupCq6fyghXsk+q5iW3khmiE4+7VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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