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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bc0596ca0fe3e8691013b905b7968910ce5c31602ed57491028330f63d34572' 
  AND token = '8VQn9/pY/4lGEvXLuBDGusDANdj6JLtO7N/CP3i80S8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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