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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8f75fe7dc86d1a033cdf05d3db66e26ecbdce711032715f73f7e8532321fd3' 
  AND token = 'jrg7Ss3CmgTrdlM8ppYqd1hgfKrso0HDeIHwe1ZIzQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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