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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0248929c3f19e6053ebd32338a736012bd503b94272080e49ed09a33f942f09' 
  AND token = 'hAazi3+sYv0obj2Z3oEyu04qQpYTGw0dhdWivA+eTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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