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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8097706cad91c2094d7a7da895cd9ce938a058b3b7fade5ba62b2c44dac741e2' 
  AND token = 'hTWqfJ3bbL3fhqKk/QDJn3CODgvs17HxLuI0mWICV3Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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