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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a44f1e93b13cbd6b4e2f551028dec5bd03fa4d8494f014513ed7a908cfbf5741' 
  AND token = 'V31p29zECuys3h0jfVjwCymIOQ2gfR4S6/YH5j3iaJk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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