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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b16f8ae9d76bf31281c8610f466037e4443b55d99ceb52a6ad5db4ff778094d6' 
  AND token = 'KKsnHzLtCpOA4VgdR7nR44A++PNZZ8m/yuHZsDSfSW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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