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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d528746197be80b96fb6054b748f6038c85e4237be528a24fccc38319f76a1d' 
  AND token = '64Fbe/r+mxAv09eOcYfJfcZqbQWfoAgBE11Y1qEeSP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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