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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f9a314ba836053861854532081ea183281a9523796c97861240c63d072a0ab9' 
  AND token = '1EwUcBF2DbtT9nxleUx+UqFpttOLj+hKXEkCcRNFTfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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