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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25e078b07c069abcd828a165f83a9ee99fe8c90d905f9a54e984c2156a5bce73' 
  AND token = '9WRKN2Tk0YbieALvev5iZdU3aPcnyvo3Qg3ELhwpyFY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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