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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b80a7c52606a95222401b885e58c8caa014e3d2ccb4e47d69d452523cecdf6a' 
  AND token = 'ytCpfiTWFPGUgwcnNKjRky4t9AkOJnkFkbESMh5ga3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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