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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd045e629e395faa44ae45f8d6ee826a476856b1fd53f4dd1c1e8929ee6598613' 
  AND token = 'E8ketWH2k92YIM6lPaTMuSik0Vw9DWegmpptH+d3ll0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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