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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85ca27d57e74dd6086cb71decf7f2884db5a56bfd2284eb9c34c8e4d3d48e814' 
  AND token = 'OumgpJdWbb4kUd51S8ifDpnVWuSm/tbDVNnUQ9RvXvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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