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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4955b9cc3cc9890162294f26a8e27ddfa4bdf4c7fb02bbe6b4e234aa76888b' 
  AND token = 'c77/QZR0kdfuvRBAZGA0v1rVbOnugko29PWyVpTch40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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