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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f5be0999ca7592b0a4df0867c9f642f7590205efa98ebbcb8b71948681ea766' 
  AND token = '8RlVAnb6njLR9PNGlKHUXsB+hJXAF7B1nlYmDusouPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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