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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d66cb9ac74790564368131b31992d387259832f71bf1870cc5b25b2e610c222' 
  AND token = '6zOw/Jwh3NeYVr2443SMMETLOT5h+C2teM4hm7NoVyY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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