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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e99afa385501a1787297b8c043a84477fc817d7105e5aee27514a95c33564ac8' 
  AND token = 'CZKm0YOpySOj8ftQRY8OfBXIVkxW28KTl3q/tk80b98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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