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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85cb03cd42d3d0eee347f26d34854d4af824b8f8935b317c4d027a0af4d2fc54' 
  AND token = '/rW+dTyHG5KjhJ2K3kxvMOqq8bc1qAPsnsMi4Us2uEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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