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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96bd9834ad9b6c3df53311a73f56427c232df7623df6ab4f427b9152bd653244' 
  AND token = 'V5BJHbiyS6cZRld6OEdA4OnDDBBAOQUyee7K8XwQYnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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