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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b9fd7f839a0f82a9cd81438495a9c3fdd55b6c6be6597e99cc43c5a6d534397' 
  AND token = '8JLn7LW3Lp2oL/BaxOsL/PufbHLaE8ivjN4boTel02Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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