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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '545c2d18f0d2ead1b52d97f7a4e44f0551c972a4d73ff27053e575921c2276cf' 
  AND token = 'RsaMRDp7YVe7gGW4tmBqG/eTlBZ3ITx61SVRK+WkMmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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