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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fd1715740e3bb22440d5c0e460e5748d295036ce9214e90c2f8b1456851c0c' 
  AND token = 'HokKpRteKNkoJnLeSUmZ57cM1fs/jg0R+HxUfgDbTW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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