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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6519e75893ccb15f68dd346ea30a65eac71289de3e073e0ff3eac8e42ce3dac1' 
  AND token = 'wKl1EdQP9+kObr1D9Bzhjoea8brX91ztUeeEMU4HwDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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