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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da3887085dcf80eca4d3fa34e1de96cdadfd7744c2e8ead8c482f9a2d893b72' 
  AND token = 'DvF31TKr9FKTvLfZEQM2Z9Lf43VBw+fnGxpX3ZqzQdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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