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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95fc314d5495ca14811f6eeeb21fb6a5463c2769cf6c4ac9ecee5be6442f03a0' 
  AND token = 'rgyGRPxeIMKCk5NqwDP/npxGQp858YobA//GqY/WKoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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