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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87c0344b4dbcd4798307e455021a7a1f2006c3d66bfa54003fb16e4ad0626124' 
  AND token = 'dUNr+n2jev5xFOWUPN17GoCZfax+Xiab/VVAD89blHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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