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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '707cf8af10d2b385587947306ea76a790e89f16b1d3264c4da2daba7063baca5' 
  AND token = '/BcpPrBqGy0Ul0W0dcZgUUBSkmaqB6BclUWkHx/1XJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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