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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f3d874c722384b0e5c0f75f1eaf5599ea92d02f009320d4627fe4a3bafd3921' 
  AND token = 'pdpz3ji86GKIw2k3WGT4grqLwSgGGph2z9OoHlgAd54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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