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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85c64a714e54805f7cf6d55eaa8c854c151d4f7c3247f6293aa10d710117070b' 
  AND token = 'aprX0ssvuf7bmIaQpEhURKFibgg1Q0q4B3Z3ge3OAYQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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