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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b684e5852da467b5c9e1a5413be2e4b847c1a96e04f1c40cfb82a71e0efbace0' 
  AND token = 'GTYqoBM9YUXDQ4lBLofKVRVMj2R9W6FONbT3dWItEiY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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