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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abd76c73c06a55cf767d734f27adea3ddf2d40b2b5ccab666db89e9c576c75ac' 
  AND token = 'xne3n1UNch3mB528js59IPiFQ1DcxxC5mAWnxKcFnGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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