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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '895f41236570ab3d21e6cc143be0a66a24abf44cc1d2b6a1708f8882dd74423f' 
  AND token = 'V7CoWVI1HCmN4qmdqPICGbumvN6euFTCdIiSdJFAqn4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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