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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f71e8fd71dfab08d4a55597190edcc09fc1529f501dc0ace9fb91fedce2d014' 
  AND token = '77MIXLP23B+c3iczViRMaHlQA3j3olsbE+bmcodvvtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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