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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30c7079e3083d4aec4c137ca3caad4616697f3b21ff5c4dd7356aac1cd5a4b10' 
  AND token = 'rp5fwjGKpjsLggKgWJ3OqDpeP/qHARjz+NHAzLF4nTA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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