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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f904f4b4383f45ec0f53a348dea95b1d1909958f15682b384933fb82a8a407b6' 
  AND token = 'RrUIF970csdEusavKWHZwj+4LWNav95Uiv7i4ZEDxdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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