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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e29037da3c8505373d75a2d5cf08862ae550cdc8062f37e9a050faaf3683d13a' 
  AND token = 'FJ8HNbJUUBRl68PHvVv3BTO+jOm+kpoPbnvwcI826lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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