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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b742310c8c6aeff9b8720864fddf1c407f6b0fa448a93947040e2ff75ae17c' 
  AND token = '+yaSvX/z1WTi6k42W4zxzSulOOlE/A1AFfloHLnPAqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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