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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5b38f246ca4b1af846784cd43362a3a459ecfd6a572b2af9ea69c98a47e698d' 
  AND token = 'XjGZFQYJqn4Bf8i/oHCYgrYijJ2dQidS6oxoDjp5a6I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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