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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92360194cb71b93e605a53c0564390effb2c5d5c26066b1f6b5e50bc973580f0' 
  AND token = '0qLsrYmFVWAvmiEC5CEI+oOxHtVMkAny2ATBXtadkgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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