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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd3fc1aa00108b6c97becfe24e1270c6b05bc63ac8c6da93bd90bef96fa7ef9' 
  AND token = '9LVf6/Pp1S7Ivpy89CU5D4itU6m/oI8zf69lJTY4WyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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